Frontiers in Carbon最新文献

筛选

英文中文

Functionalization of graphene oxide via epoxide groups: a comprehensive review of synthetic routes and challenges 环氧基团对氧化石墨烯的功能化：合成路线与挑战的全面回顾

Frontiers in Carbon Pub Date : 2024-07-25 DOI: 10.3389/frcrb.2024.1393077

Mayara G. Gonçalves, Vinícius O. Costa, André H. G. Martinez, Bernardo M. Régnier, Gabriel C. B. Gomes, Aldo Zarbin, Elisa S. Orth

{"title":"Functionalization of graphene oxide via epoxide groups: a comprehensive review of synthetic routes and challenges","authors":"Mayara G. Gonçalves, Vinícius O. Costa, André H. G. Martinez, Bernardo M. Régnier, Gabriel C. B. Gomes, Aldo Zarbin, Elisa S. Orth","doi":"10.3389/frcrb.2024.1393077","DOIUrl":"https://doi.org/10.3389/frcrb.2024.1393077","url":null,"abstract":"Graphene oxide (GO) has attracted significant attention from the scientific community due to its mechanical, optical, electrical, and chemical properties. This review outlines synthetic methods for GO functionalization, including those involving covalent and noncovalent bonds with organic molecules. In a novel contribution to this field, particular emphasis is placed on functionalization via epoxy ring opening, a poorly studied and understood topic. We first provide an overview of the basic structure and properties of graphene oxide. We then explore the various methods employed to functionalize graphene oxide, noting the complexity of these reactions, which sometimes occur in a non-specific manner. However, there are some strategies for targeted functionalization. Furthermore, we present a critical analysis of the covalent functionalization through epoxy groups, demonstrating important aspects to be considered when choosing the reaction medium. An alkaline environment seems to favor this reaction, and there is no consensus regarding the advantages and disadvantages of using basic pH in functionalization reactions. We also demonstrate some challenges involving the characterization and confirmation of the functionalization, mainly in the basal plane, and we show advances in characterization techniques that can be explored in future studies. Finally, some current challenges and future research directions are presented to contribute to the advancement of the field.","PeriodicalId":502487,"journal":{"name":"Frontiers in Carbon","volume":"13 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal 以 Co/蛇床子石为支撑的碳纳米结构用于去除硫腙

Frontiers in Carbon Pub Date : 2024-05-21 DOI: 10.3389/frcrb.2024.1402105

Emilay B T Diogo, Angelica Fonseca Pinto Vieira, Mayra Aparecida Nascimento, P. S. Pinto, Fabiano Gomes Ferreira de Paula, Renata Pereira Lopes Moreira, Ana Paula de Carvalho Teixeira

{"title":"Carbon nanostructures supported on Co/serpentinite for sulfentrazone removal","authors":"Emilay B T Diogo, Angelica Fonseca Pinto Vieira, Mayra Aparecida Nascimento, P. S. Pinto, Fabiano Gomes Ferreira de Paula, Renata Pereira Lopes Moreira, Ana Paula de Carvalho Teixeira","doi":"10.3389/frcrb.2024.1402105","DOIUrl":"https://doi.org/10.3389/frcrb.2024.1402105","url":null,"abstract":"The presence of environmental contaminants is a major problem today. In this context, it is necessary to develop new sustainable materials to be used to remediate these contaminants. In this work, the serpentinite rock was impregnated with cobalt, 5%, 10% and 20% and used as a support for the synthesis of carbon nanostructures by CVD (chemical vapour deposition) process, at 900°C. This temperature was chosen due to the high thermal stability of the carbon source. The materials were characterized by X-ray diffraction, Raman spectroscopy, thermal analysis, scanning and transmission microscopy. As expect the main phases formed were forsterite, Mg2SiO4, graphitic carbon and metallic cobalt. All the synthesis showed the formation of carbon structures as multiwalled carbon nanostructures over cobalt cores. The carbon structures showed good thermal stability, between 470 and 600°C. The higher the cobalt content, the higher the yield of the carbon structures synthesis, i.e. 14%, 23% and 37% for Serp5, Serp10 and Serp20, respectively. The produced materials were used to removal of the environmental contaminant sulfentrazone. After CVD process, the removal of sulfentrazone increase to 17.3%, 18.4% and 25.2% for Serp5, Serp10 and Serp20, respectively, showing an increase in sulfentrazone removal with the increase in carbon content. In addition, the percentage of sulfentrazone removal by Serp20 was greater at acidic pH values, decreasing from 41.7% to 12.7% with an increase from 2 to 10 in pH. The removal capacity obtained experimentally at a sulfentrazone concentration of 50 mg L−1 was equal to 14.9 mg g−1. According to literature and data obtained in this work, it was observed that the removal of contaminants from the aqueous medium occurred through two mechanisms: reduction of the organic compound by Co nanoparticles and adsorption carried out by carbon nanostructures.","PeriodicalId":502487,"journal":{"name":"Frontiers in Carbon","volume":"34 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141118247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon nanotube filled rubber nanocomposites 碳纳米管填充橡胶纳米复合材料

Frontiers in Carbon Pub Date : 2024-05-08 DOI: 10.3389/frcrb.2024.1339418

Nimita K. C, Jiji Abraham, Martin George Thomas, H. Vahabi, Hanna. J. Maria, Sabu Thomas

引用次数: 0